These functions exist for all custom fields in Jira, not just for the Checklist app. For more information, see Configuring a custom field in the Atlassian Jira documentation.
When you are creating or editing a configuration scheme context, you will need to choose what issue types and projectsthe configuration scheme will apply to:
Jira’s limitation on multiple contexts
In Jira, each custom field can have one global configuration scheme context. It can also have multiple other configuration scheme contexts, which each apply to one or more projects and to one or more issue types.
The limitation is that for a given custom field, you cannot have two configuration scheme contexts that apply to the same project. For Jira’s official response to this feature request, see the associated Jira ticket.
As a workaround, we recommend creating two different custom fields. This will enable you to create a custom configuration scheme context for each one, which can then both be associated with the project in question.